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Hi GWB Forum, I am trying to mix two seawater samples with the same chemistry, but different temperatures and calculate a flash diagram for aragonite saturation state using React following the "Fluid Mixing and Scaling" instructions. I have also calculated the endmember fluid Log(Q/K) values for aragonite using GSS. I am getting a very different answer for the end member compositions depending on which approach I take. I checked that I am using the same thermo database (phreeqpitz) for both, and am having trouble understanding why they are so different. I've attached my React file, and my gss file for your reference. Thanks for any insights, Amanda JFEndmembers.gss JanFeb-Mixing-AssumeSWinboth.rea

Hello Forum Moderator/Co-ordinator, I recently got a student version of the GWB and have been working through the tutorials ever since. I am particularly interested in fluid mixing and the tendency of fluids to form scales. It appears to me that only the REACT module/application can conveniently handle the scale formation side of things. Unfortunately, the REACT module does not come with the student version. Is there a workaround, say using other modules that come with the student version of GWB, or I necessarily have to have REACT? Kind regards.

Hi all, I have got a simple question regarding to mixing of multiple fluids. I’m sure that I must have missed something, so I just wanted to check. I have the composition of three end-member solutions (Solution 1, 2, 3) that would be mixed to produce composition of Solution 4. Say 20%, 30% and 50% of Solution 4 is from Solution 1, 2, 3 respectively. I have the composition of all Solution 1, 2, 3, 4. Essentially I would like to check the mixing fraction through React (at which I have calculated manually) to see whether it gives me a good match for the solution 4 composition. I would like to run this mixing reaction through the REACT model to get the final concentration of Solution 4 with the known composition and mixing fraction of Solution1-3. But from my understanding, is it correct that I can only mix/react one solution with another one at a time on REACT? And of course if I run reaction of solution 1 and 2, pick up>reactant>fluid to react with solution 3 will not give the answer that I wanted since it’s a different mechanism. I have tried GSS where I can mix all three solution all at once. But when I did a test run of only mixing two solutions on GSS, it gives different results from reacting two solutions on REACT. So two questions: What is the best way to do fluid mixing of more than two solutions that accounts for different mixing fraction? What are the difference between GSS mixing function and React? i.e. say if I’m to mix two solutions together. Thank you very much for your help. Have a lovely day. Cheers, Charis